10個足以改變世界觀的恐怖事實，你準備好了嗎？
從免疫系統到宇宙病毒，精選自Reddit社群的科學冷知識，可能會讓你感到毛骨悚然，甚至改變你對世界的看法。
你知道嗎？一旦狂犬病症狀發作，就再也無法治癒。我們的日常生活看似平淡無奇，實則暗藏著許多令人細思極恐的真相。最近，在社群平台Reddit上，一則「哪些事實讓你真心感到害怕？」的討論引發熱議，從宇宙的浩瀚到人體的脆弱，網友們的回答讓人不寒而慄。
看不見的宇宙：病毒與微生物的驚人尺度
首先，我們周遭的微觀世界，其規模就足以讓人震驚。地球上的樹木數量（約3兆棵）比銀河系中的恆星（約1000億至4000億顆）還多。然而，地球上的病毒總數（約10的31次方）卻遠遠超過整個可觀測宇宙中的恆星總數（約10的24次方）。有網友表示：「你就像一艘行走的肉體太空船，被看不見的生物海洋所覆蓋，只要你的免疫系統放個假，幾天內你就完了。」
人體的脆弱：隨時可能降臨的「那一天」
我們的身體，遠比想像中更加不堪一擊。例如，狂犬病（Rabies）一旦出現症狀，死亡率幾乎是100%，沒有任何治癒方法。中風可能在任何時間點發生在任何人身上。更恐怖的是普利昂蛋白（Prions）的存在，這種變異蛋白質會導致其他蛋白質錯誤摺疊，最終破壞大腦，且無法治癒。
失智症也帶來一種無聲的恐懼。一則評論寫道：「如果你有一天得了失智症，那麼必然會有一個『沒有失智症的最後一天』，但你永遠不會知道是哪一天。」這句話精準地描繪了意識被逐漸侵蝕的無力感。
文明的崩壞與被遺忘的宿命
不僅個人，人類文明本身也並非堅不可摧。發生在1859年的太陽風暴，曾強大到讓電報線路迸出火花。若同樣等級的風暴襲擊現代地球，全球電網與電子設備將可能毀於一旦，導致社會秩序崩潰。此外，無論你的一生多麼精彩，幾個世代後，甚至1000年後，你所有的思想、夢想和行動都將歸零，沒有人會記得。這點出了人類存在終將被遺忘的宿命。
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